1977512078 has 8 divisors (see below), whose sum is σ = 3095236368. Its totient is φ = 945766624.

The previous prime is 1977512071. The next prime is 1977512081. The reversal of 1977512078 is 8702157791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977512071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21494651 + ... + 21494742.

It is an arithmetic number, because the mean of its divisors is an integer number (386904546).

Almost surely, 2^1977512078 is an apocalyptic number.

1977512078 is a deficient number, since it is larger than the sum of its proper divisors (1117724290).

1977512078 is a wasteful number, since it uses less digits than its factorization.

1977512078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42989418.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 1977512078 is about 44469.2261907041. The cubic root of 1977512078 is about 1255.1810721630.

The spelling of 1977512078 in words is "one billion, nine hundred seventy-seven million, five hundred twelve thousand, seventy-eight".